影响北京沙尘源地的气候特征与北京沙尘天气分析

Climate Character Affecting Beijing's Dust Sources and Analysis of the Dust Weather in Beijing

分析并找出了影响北京沙尘暴天气的源地,该源地主要位于北京北部的浑善达克沙地的西北部边缘,内蒙古中西部、河套以西地区的沙漠、荒漠化地区以及干旱、半干旱地区广大的农业开垦区,指出影响北京的沙尘传输路径有3条,即西路、北路和西北路。对源地的气候特征做进一步分析表明,源地的气候特征为温暖干旱、降水不足,这些因素加速了沙尘天气的发生。同时将源地春季降水和北京沙尘天气相比较,发现北路和西北路源地春季降水和北京沙尘暴天气有较好的负相关,西路源地春季降水和北京浮尘天气有较好的负相关。

The sources affecting Bejings dust storm weather are analyzed and found out,which are mainly located in desert,desertification regions and vast agriculture reclamation areas in arid and semi\|arid areas that are in the west fringe of the Hunshandake Sand in morth Beijing,in the center and west region of Inner Mongolia,and in the west He\|Tao area.There are three dust transport paths that influence Beijing,i.e.west route,north route and northwest route.The climate characters are further analyzed and shown to be warm,drought and lacking precipitation,which accelerates formation of dust weather.In addition,dust sources spring precipitation and Beijings dust storm frequency are compared.There is a distinct negative correlation between Beijing's dust storms frequency and spring precipitation at northwest route and north route dust sources,while there is a distinct negative correlation between Beijing's floating dust frequcncy and spring precipitation at west route dust sources.